题干
We waited and waited．_________ we had been looking forward to ．
A：Then came the hour
B：Then did the hour come
C：Then the hour came
D：The hour then came
答案(点此获取答案解析）
A
的左右焦点分别为
，弦
过
，若
的内切圆周长为
，
两点的坐标分别为
，则
值为（）